Fig. REF  shows the overall procedure of the proposed image-enhancing network \(f_{\mbox{\footnotesize {IE}}}\) . Inspired by M-net [1]}, the proposed network has side-input and side-output layers. In the side-input layers, intra-oral scan data \(\mbox{\textbf {O}}\)  with suitable resizing is repeatedly added to the encoding path after \(3\times 3\)  convolution. In the side-output layers, tooth segmentation masks are obtained during the decoding path. The detailed backbone structure can be found in [1]}.
